Coupling / filtering

In the coupling menu, you may choose the type of temporal filtering applied to the ECGs.

If you choose baseline correction (the default value) the mean value
of the potentials is set such that their values at the beginning of the P wave
and at the termination of the T wave are zero.

If you choose AC coupling the mean of the potential over time will
be set to zero for all leads (as results from AC coupling without baseline correction).

If you choose DC coupling no filtering of the ECGs is applied (the true DC
level is shown).

Beat / time selection

If surface potentials are displayed in the
Heart or thorax
views, the vertical YELLOW lines visible
in the plots indicate the time instant for which the potential maps are displayed.
The time instant may be set by clicking on the left mouse button within the leads view or by
dragging the line to the desired position with the mouse while holding down the left mouse
button. You may also press the left and right arrow keys to in- and decrease the selected time with
steps of 2 ms.
When the case file contains more then one beat (atrial and/or ventricle), you can zoom in to one beat
by double clicking with the left mouse button on a time moment withing the desired beat. The choice
between the ventricle or atria information shown in the TMP pane is determained by the current shown
part in the heart pane.
To restore the signals to show all beats, double click the left mouse button again.

When an interval is being selected in this leads view, the same interval will be indicated
in the TMP pane. This will be done by making the part(s) that
do not belong to the selected interval a bit lighter in color.

Vector cardiogram (VCG)

The VCG is derived from the Frank lead system. Three cross sections of the thorax are shown,
drawn through the center of gravity of the ventricular myocardium. The loops shown are the
projections of the 3D vector loop onto each of the planes.

Note: The horizontal plane is viewed from the feet.

Scale

The amplitude scale can be changed by scrolling the mouse wheel.

Copying the content of the leads view

The image shown in the leads view may be copied to the clipboard
by selecting -Copy- from main menu item -Edit- and then choose -ECG-,
or by pressing <Ctrl>-C while the mouse is within the leads view.